isl_input.c

   1 /*
   2  * Copyright 2008-2009 Katholieke Universiteit Leuven
   3  * Copyright 2010      INRIA Saclay
   4  *
   5  * Use of this software is governed by the GNU LGPLv2.1 license
   6  *
   7  * Written by Sven Verdoolaege, K.U.Leuven, Departement
   8  * Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium
   9  * and INRIA Saclay - Ile-de-France, Parc Club Orsay Universite,
  10  * ZAC des vignes, 4 rue Jacques Monod, 91893 Orsay, France
  11  */
  12
  13 #include <ctype.h>
  14 #include <stdio.h>
  15 #include <string.h>
  16 #include <strings.h>
  17 #include <isl_set.h>
  18 #include <isl_seq.h>
  19 #include "isl_stream.h"
  20 #include "isl_map_private.h"
  21
  22 struct variable {
  23         char                    *name;
  24         int                      pos;
  25         struct variable         *next;
  26 };
  27
  28 struct vars {
  29         struct isl_ctx  *ctx;
  30         int              n;
  31         struct variable *v;
  32 };
  33
  34 static struct vars *vars_new(struct isl_ctx *ctx)
  35 {
  36         struct vars *v;
  37         v = isl_alloc_type(ctx, struct vars);
  38         if (!v)
  39                 return NULL;
  40         v->ctx = ctx;
  41         v->n = 0;
  42         v->v = NULL;
  43         return v;
  44 }
  45
  46 static void variable_free(struct variable *var)
  47 {
  48         while (var) {
  49                 struct variable *next = var->next;
  50                 free(var->name);
  51                 free(var);
  52                 var = next;
  53         }
  54 }
  55
  56 static void vars_free(struct vars *v)
  57 {
  58         if (!v)
  59                 return;
  60         variable_free(v->v);
  61         free(v);
  62 }
  63
  64 static struct variable *variable_new(struct vars *v, const char *name, int len,
  65                                 int pos)
  66 {
  67         struct variable *var;
  68         var = isl_alloc_type(v->ctx, struct variable);
  69         if (!var)
  70                 goto error;
  71         var->name = strdup(name);
  72         var->name[len] = '\0';
  73         var->pos = pos;
  74         var->next = v->v;
  75         return var;
  76 error:
  77         variable_free(v->v);
  78         return NULL;
  79 }
  80
  81 static int vars_pos(struct vars *v, const char *s, int len)
  82 {
  83         int pos;
  84         struct variable *q;
  85
  86         if (len == -1)
  87                 len = strlen(s);
  88         for (q = v->v; q; q = q->next) {
  89                 if (strncmp(q->name, s, len) == 0 && q->name[len] == '\0')
  90                         break;
  91         }
  92         if (q)
  93                 pos = q->pos;
  94         else {
  95                 pos = v->n;
  96                 v->v = variable_new(v, s, len, v->n);
  97                 if (!v->v)
  98                         return -1;
  99                 v->n++;
 100         }
 101         return pos;
 102 }
 103
 104 static struct vars *read_var_list(struct isl_stream *s, struct vars *v)
 105 {
 106         struct isl_token *tok;
 107
 108         while ((tok = isl_stream_next_token(s)) != NULL) {
 109                 int p;
 110                 int n = v->n;
 111
 112                 if (tok->type != ISL_TOKEN_IDENT)
 113                         break;
 114
 115                 p = vars_pos(v, tok->u.s, -1);
 116                 if (p < 0)
 117                         goto error;
 118                 if (p < n) {
 119                         isl_stream_error(s, tok, "expecting unique identifier");
 120                         goto error;
 121                 }
 122                 isl_token_free(tok);
 123                 tok = isl_stream_next_token(s);
 124                 if (!tok || tok->type != ',')
 125                         break;
 126
 127                 isl_token_free(tok);
 128         }
 129         if (tok)
 130                 isl_stream_push_token(s, tok);
 131
 132         return v;
 133 error:
 134         isl_token_free(tok);
 135         vars_free(v);
 136         return NULL;
 137 }
 138
 139 static struct isl_vec *accept_affine(struct isl_stream *s, struct vars *v)
 140 {
 141         struct isl_token *tok = NULL;
 142         struct isl_vec *aff;
 143
 144         aff = isl_vec_alloc(v->ctx, 1 + v->n);
 145         isl_seq_clr(aff->el, aff->size);
 146         if (!aff)
 147                 return NULL;
 148
 149         for (;;) {
 150                 tok = isl_stream_next_token(s);
 151                 if (!tok) {
 152                         isl_stream_error(s, NULL, "unexpected EOF");
 153                         goto error;
 154                 }
 155                 if (tok->type == ISL_TOKEN_IDENT) {
 156                         int n = v->n;
 157                         int pos = vars_pos(v, tok->u.s, -1);
 158                         if (pos < 0)
 159                                 goto error;
 160                         if (pos >= n) {
 161                                 isl_stream_error(s, tok, "unknown identifier");
 162                                 goto error;
 163                         }
 164                         isl_int_add_ui(aff->el[1 + pos], aff->el[1 + pos], 1);
 165                 } else if (tok->type == ISL_TOKEN_VALUE) {
 166                         struct isl_token *tok2;
 167                         int n = v->n;
 168                         int pos = -1;
 169                         tok2 = isl_stream_next_token(s);
 170                         if (tok2 && tok2->type == ISL_TOKEN_IDENT) {
 171                                 pos = vars_pos(v, tok2->u.s, -1);
 172                                 if (pos < 0)
 173                                         goto error;
 174                                 if (pos >= n) {
 175                                         isl_stream_error(s, tok2,
 176                                                 "unknown identifier");
 177                                         isl_token_free(tok2);
 178                                         goto error;
 179                                 }
 180                                 isl_token_free(tok2);
 181                         } else if (tok2)
 182                                 isl_stream_push_token(s, tok2);
 183                         isl_int_add(aff->el[1 + pos],
 184                                         aff->el[1 + pos], tok->u.v);
 185                 } else if (tok->type == '+') {
 186                         /* nothing */
 187                 } else {
 188                         isl_stream_push_token(s, tok);
 189                         break;
 190                 }
 191                 isl_token_free(tok);
 192         }
 193
 194         return aff;
 195 error:
 196         isl_vec_free(aff);
 197         return NULL;
 198 }
 199
 200 static struct isl_basic_map *add_div_definition(struct isl_stream *s,
 201         struct vars *v, struct isl_basic_map *bmap, int k)
 202 {
 203         struct isl_token *tok;
 204         int seen_paren = 0;
 205         struct isl_vec *aff;
 206
 207         if (isl_stream_eat(s, '['))
 208                 goto error;
 209
 210         tok = isl_stream_next_token(s);
 211         if (!tok)
 212                 goto error;
 213         if (tok->type == '(') {
 214                 seen_paren = 1;
 215                 isl_token_free(tok);
 216         } else
 217                 isl_stream_push_token(s, tok);
 218
 219         aff = accept_affine(s, v);
 220         if (!aff)
 221                 goto error;
 222
 223         isl_seq_cpy(bmap->div[k] + 1, aff->el, aff->size);
 224
 225         isl_vec_free(aff);
 226
 227         if (seen_paren && isl_stream_eat(s, ')'))
 228                 goto error;
 229         if (isl_stream_eat(s, '/'))
 230                 goto error;
 231
 232         tok = isl_stream_next_token(s);
 233         if (!tok)
 234                 goto error;
 235         if (tok->type != ISL_TOKEN_VALUE) {
 236                 isl_stream_error(s, tok, "expected denominator");
 237                 isl_stream_push_token(s, tok);
 238                 goto error;
 239         }
 240         isl_int_set(bmap->div[k][0], tok->u.v);
 241         isl_token_free(tok);
 242
 243         if (isl_stream_eat(s, ']'))
 244                 goto error;
 245
 246         if (isl_basic_map_add_div_constraints(bmap, k) < 0)
 247                 goto error;
 248
 249         return bmap;
 250 error:
 251         isl_basic_map_free(bmap);
 252         return NULL;
 253 }
 254
 255 static struct isl_basic_map *read_defined_var_list(struct isl_stream *s,
 256         struct vars *v, struct isl_basic_map *bmap)
 257 {
 258         struct isl_token *tok;
 259
 260         while ((tok = isl_stream_next_token(s)) != NULL) {
 261                 int k;
 262                 int p;
 263                 int n = v->n;
 264                 unsigned total = isl_basic_map_total_dim(bmap);
 265
 266                 if (tok->type != ISL_TOKEN_IDENT)
 267                         break;
 268
 269                 p = vars_pos(v, tok->u.s, -1);
 270                 if (p < 0)
 271                         goto error;
 272                 if (p < n) {
 273                         isl_stream_error(s, tok, "expecting unique identifier");
 274                         goto error;
 275                 }
 276                 isl_token_free(tok);
 277
 278                 bmap = isl_basic_map_cow(bmap);
 279                 bmap = isl_basic_map_extend_dim(bmap, isl_dim_copy(bmap->dim),
 280                                                 1, 0, 2);
 281
 282                 if ((k = isl_basic_map_alloc_div(bmap)) < 0)
 283                         goto error;
 284                 isl_seq_clr(bmap->div[k], 1 + 1 + total);
 285
 286                 tok = isl_stream_next_token(s);
 287                 if (tok && tok->type == '=') {
 288                         isl_token_free(tok);
 289                         bmap = add_div_definition(s, v, bmap, k);
 290                         tok = isl_stream_next_token(s);
 291                 }
 292
 293                 if (!tok || tok->type != ',')
 294                         break;
 295
 296                 isl_token_free(tok);
 297         }
 298         if (tok)
 299                 isl_stream_push_token(s, tok);
 300
 301         return bmap;
 302 error:
 303         isl_token_free(tok);
 304         isl_basic_map_free(bmap);
 305         return NULL;
 306 }
 307
 308 static struct vars *read_tuple(struct isl_stream *s, struct vars *v)
 309 {
 310         struct isl_token *tok;
 311
 312         tok = isl_stream_next_token(s);
 313         if (!tok || tok->type != '[') {
 314                 isl_stream_error(s, tok, "expecting '['");
 315                 goto error;
 316         }
 317         isl_token_free(tok);
 318         v = read_var_list(s, v);
 319         tok = isl_stream_next_token(s);
 320         if (!tok || tok->type != ']') {
 321                 isl_stream_error(s, tok, "expecting ']'");
 322                 goto error;
 323         }
 324         isl_token_free(tok);
 325
 326         return v;
 327 error:
 328         if (tok)
 329                 isl_token_free(tok);
 330         vars_free(v);
 331         return NULL;
 332 }
 333
 334 static struct isl_basic_map *add_constraints(struct isl_stream *s,
 335         struct vars **v, struct isl_basic_map *bmap);
 336
 337 static struct isl_basic_map *add_exists(struct isl_stream *s,
 338         struct vars **v, struct isl_basic_map *bmap)
 339 {
 340         struct isl_token *tok;
 341         int n = (*v)->n;
 342         int extra;
 343         int seen_paren = 0;
 344         int i;
 345         unsigned total;
 346
 347         tok = isl_stream_next_token(s);
 348         if (!tok)
 349                 goto error;
 350         if (tok->type == '(') {
 351                 seen_paren = 1;
 352                 isl_token_free(tok);
 353         } else
 354                 isl_stream_push_token(s, tok);
 355
 356         bmap = read_defined_var_list(s, *v, bmap);
 357         if (!bmap)
 358                 goto error;
 359
 360         if (isl_stream_eat(s, ':'))
 361                 goto error;
 362         bmap = add_constraints(s, v, bmap);
 363         if (seen_paren && isl_stream_eat(s, ')'))
 364                 goto error;
 365         return bmap;
 366 error:
 367         isl_basic_map_free(bmap);
 368         return NULL;
 369 }
 370
 371 static struct isl_basic_map *add_constraint(struct isl_stream *s,
 372         struct vars **v, struct isl_basic_map *bmap)
 373 {
 374         unsigned total = isl_basic_map_total_dim(bmap);
 375         int k;
 376         struct isl_token *tok = NULL;
 377         struct isl_vec *aff1 = NULL, *aff2 = NULL;
 378
 379         tok = isl_stream_next_token(s);
 380         if (!tok)
 381                 goto error;
 382         if (tok->type == ISL_TOKEN_EXISTS) {
 383                 isl_token_free(tok);
 384                 return add_exists(s, v, bmap);
 385         }
 386         isl_stream_push_token(s, tok);
 387         tok = NULL;
 388
 389         bmap = isl_basic_map_cow(bmap);
 390         bmap = isl_basic_map_extend_constraints(bmap, 0, 1);
 391         k = isl_basic_map_alloc_inequality(bmap);
 392         if (k < 0)
 393                 goto error;
 394
 395         aff1 = accept_affine(s, *v);
 396         if (!aff1)
 397                 goto error;
 398         tok = isl_stream_next_token(s);
 399         switch (tok->type) {
 400         case ISL_TOKEN_LE:
 401         case ISL_TOKEN_GE:
 402         case '=':
 403                 break;
 404         default:
 405                 isl_stream_error(s, tok, "missing operator");
 406                 isl_stream_push_token(s, tok);
 407                 goto error;
 408         }
 409         aff2 = accept_affine(s, *v);
 410         if (!aff2)
 411                 goto error;
 412         isl_assert(aff1->ctx, aff1->size == 1 + total, goto error);
 413         isl_assert(aff2->ctx, aff2->size == 1 + total, goto error);
 414
 415         if (tok->type == ISL_TOKEN_LE)
 416                 isl_seq_combine(bmap->ineq[k], (*v)->ctx->negone, aff1->el,
 417                                                (*v)->ctx->one, aff2->el,
 418                                                aff1->size);
 419         else if (tok->type == ISL_TOKEN_GE)
 420                 isl_seq_combine(bmap->ineq[k], (*v)->ctx->one, aff1->el,
 421                                                (*v)->ctx->negone, aff2->el,
 422                                                aff1->size);
 423         else {
 424                 isl_seq_combine(bmap->ineq[k], (*v)->ctx->one, aff1->el,
 425                                                (*v)->ctx->negone, aff2->el,
 426                                                aff1->size);
 427                 isl_basic_map_inequality_to_equality(bmap, k);
 428         }
 429         isl_token_free(tok);
 430         isl_vec_free(aff1);
 431         isl_vec_free(aff2);
 432
 433         return bmap;
 434 error:
 435         if (tok)
 436                 isl_token_free(tok);
 437         isl_vec_free(aff1);
 438         isl_vec_free(aff2);
 439         isl_basic_map_free(bmap);
 440         return NULL;
 441 }
 442
 443 static struct isl_basic_map *add_constraints(struct isl_stream *s,
 444         struct vars **v, struct isl_basic_map *bmap)
 445 {
 446         struct isl_token *tok;
 447
 448         for (;;) {
 449                 bmap = add_constraint(s, v, bmap);
 450                 if (!bmap)
 451                         return NULL;
 452                 tok = isl_stream_next_token(s);
 453                 if (!tok) {
 454                         isl_stream_error(s, NULL, "unexpected EOF");
 455                         goto error;
 456                 }
 457                 if (tok->type != ISL_TOKEN_AND)
 458                         break;
 459                 isl_token_free(tok);
 460         }
 461         isl_stream_push_token(s, tok);
 462
 463         return bmap;
 464 error:
 465         if (tok)
 466                 isl_token_free(tok);
 467         isl_basic_map_free(bmap);
 468         return NULL;
 469 }
 470
 471 static __isl_give isl_basic_map *basic_map_read_polylib_constraint(
 472         struct isl_stream *s, __isl_take isl_basic_map *bmap)
 473 {
 474         int j;
 475         struct isl_token *tok;
 476         int type;
 477         int k;
 478         isl_int *c;
 479         unsigned nparam;
 480         unsigned dim;
 481
 482         if (!bmap)
 483                 return NULL;
 484
 485         nparam = isl_basic_map_dim(bmap, isl_dim_param);
 486         dim = isl_basic_map_dim(bmap, isl_dim_out);
 487
 488         tok = isl_stream_next_token(s);
 489         if (!tok || tok->type != ISL_TOKEN_VALUE) {
 490                 isl_stream_error(s, tok, "expecting coefficient");
 491                 if (tok)
 492                         isl_stream_push_token(s, tok);
 493                 goto error;
 494         }
 495         if (!tok->on_new_line) {
 496                 isl_stream_error(s, tok, "coefficient should appear on new line");
 497                 isl_stream_push_token(s, tok);
 498                 goto error;
 499         }
 500
 501         type = isl_int_get_si(tok->u.v);
 502         isl_token_free(tok);
 503
 504         isl_assert(s->ctx, type == 0 || type == 1, goto error);
 505         if (type == 0) {
 506                 k = isl_basic_map_alloc_equality(bmap);
 507                 c = bmap->eq[k];
 508         } else {
 509                 k = isl_basic_map_alloc_inequality(bmap);
 510                 c = bmap->ineq[k];
 511         }
 512         if (k < 0)
 513                 goto error;
 514
 515         for (j = 0; j < dim; ++j) {
 516                 tok = isl_stream_next_token(s);
 517                 if (!tok || tok->type != ISL_TOKEN_VALUE) {
 518                         isl_stream_error(s, tok, "expecting coefficient");
 519                         if (tok)
 520                                 isl_stream_push_token(s, tok);
 521                         goto error;
 522                 }
 523                 isl_int_set(c[1 + nparam + j], tok->u.v);
 524                 isl_token_free(tok);
 525         }
 526         for (j = 0; j < nparam; ++j) {
 527                 tok = isl_stream_next_token(s);
 528                 if (!tok || tok->type != ISL_TOKEN_VALUE) {
 529                         isl_stream_error(s, tok, "expecting coefficient");
 530                         if (tok)
 531                                 isl_stream_push_token(s, tok);
 532                         goto error;
 533                 }
 534                 isl_int_set(c[1 + j], tok->u.v);
 535                 isl_token_free(tok);
 536         }
 537         tok = isl_stream_next_token(s);
 538         if (!tok || tok->type != ISL_TOKEN_VALUE) {
 539                 isl_stream_error(s, tok, "expecting coefficient");
 540                 if (tok)
 541                         isl_stream_push_token(s, tok);
 542                 goto error;
 543         }
 544         isl_int_set(c[0], tok->u.v);
 545         isl_token_free(tok);
 546
 547         return bmap;
 548 error:
 549         isl_basic_map_free(bmap);
 550         return NULL;
 551 }
 552
 553 static __isl_give isl_basic_map *basic_map_read_polylib(struct isl_stream *s,
 554         int nparam)
 555 {
 556         int i;
 557         struct isl_token *tok;
 558         struct isl_token *tok2;
 559         int n_row, n_col;
 560         int on_new_line;
 561         unsigned dim;
 562         struct isl_basic_map *bmap = NULL;
 563
 564         if (nparam < 0)
 565                 nparam = 0;
 566
 567         tok = isl_stream_next_token(s);
 568         if (!tok) {
 569                 isl_stream_error(s, NULL, "unexpected EOF");
 570                 return NULL;
 571         }
 572         tok2 = isl_stream_next_token(s);
 573         if (!tok2) {
 574                 isl_token_free(tok);
 575                 isl_stream_error(s, NULL, "unexpected EOF");
 576                 return NULL;
 577         }
 578         n_row = isl_int_get_si(tok->u.v);
 579         n_col = isl_int_get_si(tok2->u.v);
 580         on_new_line = tok2->on_new_line;
 581         isl_token_free(tok2);
 582         isl_token_free(tok);
 583         isl_assert(s->ctx, !on_new_line, return NULL);
 584         isl_assert(s->ctx, n_row >= 0, return NULL);
 585         isl_assert(s->ctx, n_col >= 2 + nparam, return NULL);
 586         dim = n_col - 2 - nparam;
 587         bmap = isl_basic_map_alloc(s->ctx, nparam, 0, dim, 0, n_row, n_row);
 588         if (!bmap)
 589                 return NULL;
 590
 591         for (i = 0; i < n_row; ++i)
 592                 bmap = basic_map_read_polylib_constraint(s, bmap);
 593
 594         bmap = isl_basic_map_simplify(bmap);
 595         bmap = isl_basic_map_finalize(bmap);
 596         return bmap;
 597 }
 598
 599 static struct isl_map *map_read_polylib(struct isl_stream *s, int nparam)
 600 {
 601         struct isl_token *tok;
 602         struct isl_token *tok2;
 603         int i, n;
 604         struct isl_map *map;
 605
 606         tok = isl_stream_next_token(s);
 607         if (!tok) {
 608                 isl_stream_error(s, NULL, "unexpected EOF");
 609                 return NULL;
 610         }
 611         tok2 = isl_stream_next_token(s);
 612         if (!tok2) {
 613                 isl_token_free(tok);
 614                 isl_stream_error(s, NULL, "unexpected EOF");
 615                 return NULL;
 616         }
 617         if (!tok2->on_new_line) {
 618                 isl_stream_push_token(s, tok2);
 619                 isl_stream_push_token(s, tok);
 620                 return isl_map_from_basic_map(basic_map_read_polylib(s, nparam));
 621         }
 622         isl_stream_push_token(s, tok2);
 623         n = isl_int_get_si(tok->u.v);
 624         isl_token_free(tok);
 625
 626         isl_assert(s->ctx, n >= 1, return NULL);
 627
 628         map = isl_map_from_basic_map(basic_map_read_polylib(s, nparam));
 629
 630         for (i = 1; i < n; ++i)
 631                 map = isl_map_union(map,
 632                         isl_map_from_basic_map(basic_map_read_polylib(s, nparam)));
 633
 634         return map;
 635 }
 636
 637 static struct isl_dim *set_names(struct isl_dim *dim, struct vars *vars,
 638         enum isl_dim_type type, int offset, int n)
 639 {
 640         int i;
 641         struct variable *v;
 642
 643         for (i = 0, v = vars->v; i < offset; ++i, v = v->next)
 644                 ;
 645         for (i = n - 1; i >= 0; --i, v = v->next)
 646                 dim = isl_dim_set_name(dim, type, i, v->name);
 647
 648         return dim;
 649 }
 650
 651 static struct isl_dim *dim_from_vars(struct vars *vars,
 652         int nparam, int n_in, int n_out)
 653 {
 654         struct isl_dim *dim;
 655
 656         dim = isl_dim_alloc(vars->ctx, nparam, n_in, n_out);
 657         dim = set_names(dim, vars, isl_dim_param, n_out + n_in, nparam);
 658         dim = set_names(dim, vars, isl_dim_in, n_out, n_in);
 659         dim = set_names(dim, vars, isl_dim_out, 0, n_out);
 660
 661         return dim;
 662 }
 663
 664 static struct isl_map *map_read(struct isl_stream *s, int nparam)
 665 {
 666         struct isl_dim *dim;
 667         struct isl_basic_map *bmap = NULL;
 668         struct isl_token *tok;
 669         struct vars *v = NULL;
 670         int n1;
 671         int n2;
 672
 673         tok = isl_stream_next_token(s);
 674         if (!tok) {
 675                 isl_stream_error(s, NULL, "unexpected EOF");
 676                 goto error;
 677         }
 678         if (tok->type == ISL_TOKEN_VALUE) {
 679                 isl_stream_push_token(s, tok);
 680                 return map_read_polylib(s, nparam);
 681         }
 682         v = vars_new(s->ctx);
 683         if (tok->type == '[') {
 684                 isl_stream_push_token(s, tok);
 685                 v = read_tuple(s, v);
 686                 if (!v)
 687                         return NULL;
 688                 if (nparam >= 0)
 689                         isl_assert(s->ctx, nparam == v->n, goto error);
 690                 nparam = v->n;
 691                 tok = isl_stream_next_token(s);
 692                 if (!tok || tok->type != ISL_TOKEN_TO) {
 693                         isl_stream_error(s, tok, "expecting '->'");
 694                         if (tok)
 695                                 isl_stream_push_token(s, tok);
 696                         goto error;
 697                 }
 698                 isl_token_free(tok);
 699                 tok = isl_stream_next_token(s);
 700         }
 701         if (nparam < 0)
 702                 nparam = 0;
 703         if (!tok || tok->type != '{') {
 704                 isl_stream_error(s, tok, "expecting '{'");
 705                 if (tok)
 706                         isl_stream_push_token(s, tok);
 707                 goto error;
 708         }
 709         isl_token_free(tok);
 710         v = read_tuple(s, v);
 711         if (!v)
 712                 return NULL;
 713         n1 = v->n - nparam;
 714         tok = isl_stream_next_token(s);
 715         if (tok && tok->type == ISL_TOKEN_TO) {
 716                 isl_token_free(tok);
 717                 v = read_tuple(s, v);
 718                 if (!v)
 719                         return NULL;
 720                 n2 = v->n - n1 - nparam;
 721         } else {
 722                 if (tok)
 723                         isl_stream_push_token(s, tok);
 724                 n2 = n1;
 725                 n1 = 0;
 726         }
 727         dim = dim_from_vars(v, nparam, n1, n2);
 728         bmap = isl_basic_map_alloc_dim(dim, 0, 0, 0);
 729         if (!bmap)
 730                 goto error;
 731         tok = isl_stream_next_token(s);
 732         if (tok && tok->type == ':') {
 733                 isl_token_free(tok);
 734                 bmap = add_constraints(s, &v, bmap);
 735                 tok = isl_stream_next_token(s);
 736         }
 737         if (tok && tok->type == '}') {
 738                 isl_token_free(tok);
 739         } else {
 740                 isl_stream_error(s, tok, "unexpected isl_token");
 741                 if (tok)
 742                         isl_token_free(tok);
 743                 goto error;
 744         }
 745         vars_free(v);
 746
 747         bmap = isl_basic_map_simplify(bmap);
 748         bmap = isl_basic_map_finalize(bmap);
 749         return isl_map_from_basic_map(bmap);
 750 error:
 751         isl_basic_map_free(bmap);
 752         if (v)
 753                 vars_free(v);
 754         return NULL;
 755 }
 756
 757 static struct isl_basic_map *basic_map_read(struct isl_stream *s, int nparam)
 758 {
 759         struct isl_map *map;
 760         struct isl_basic_map *bmap;
 761
 762         map = map_read(s, nparam);
 763         if (!map)
 764                 return NULL;
 765
 766         isl_assert(map->ctx, map->n <= 1, goto error);
 767
 768         if (map->n == 0)
 769                 bmap = isl_basic_map_empty_like_map(map);
 770         else
 771                 bmap = isl_basic_map_copy(map->p[0]);
 772
 773         isl_map_free(map);
 774
 775         return bmap;
 776 error:
 777         isl_map_free(map);
 778         return NULL;
 779 }
 780
 781 __isl_give isl_basic_map *isl_basic_map_read_from_file(isl_ctx *ctx,
 782                 FILE *input, int nparam)
 783 {
 784         struct isl_basic_map *bmap;
 785         struct isl_stream *s = isl_stream_new_file(ctx, input);
 786         if (!s)
 787                 return NULL;
 788         bmap = basic_map_read(s, nparam);
 789         isl_stream_free(s);
 790         return bmap;
 791 }
 792
 793 __isl_give isl_basic_set *isl_basic_set_read_from_file(isl_ctx *ctx,
 794                 FILE *input, int nparam)
 795 {
 796         struct isl_basic_map *bmap;
 797         bmap = isl_basic_map_read_from_file(ctx, input, nparam);
 798         if (!bmap)
 799                 return NULL;
 800         isl_assert(ctx, isl_basic_map_n_in(bmap) == 0, goto error);
 801         return (struct isl_basic_set *)bmap;
 802 error:
 803         isl_basic_map_free(bmap);
 804         return NULL;
 805 }
 806
 807 struct isl_basic_map *isl_basic_map_read_from_str(struct isl_ctx *ctx,
 808                 const char *str, int nparam)
 809 {
 810         struct isl_basic_map *bmap;
 811         struct isl_stream *s = isl_stream_new_str(ctx, str);
 812         if (!s)
 813                 return NULL;
 814         bmap = basic_map_read(s, nparam);
 815         isl_stream_free(s);
 816         return bmap;
 817 }
 818
 819 struct isl_basic_set *isl_basic_set_read_from_str(struct isl_ctx *ctx,
 820                 const char *str, int nparam)
 821 {
 822         struct isl_basic_map *bmap;
 823         bmap = isl_basic_map_read_from_str(ctx, str, nparam);
 824         if (!bmap)
 825                 return NULL;
 826         isl_assert(ctx, isl_basic_map_n_in(bmap) == 0, goto error);
 827         return (struct isl_basic_set *)bmap;
 828 error:
 829         isl_basic_map_free(bmap);
 830         return NULL;
 831 }
 832
 833 __isl_give isl_map *isl_map_read_from_file(struct isl_ctx *ctx,
 834                 FILE *input, int nparam)
 835 {
 836         struct isl_map *map;
 837         struct isl_stream *s = isl_stream_new_file(ctx, input);
 838         if (!s)
 839                 return NULL;
 840         map = map_read(s, nparam);
 841         isl_stream_free(s);
 842         return map;
 843 }
 844
 845 __isl_give isl_set *isl_set_read_from_file(struct isl_ctx *ctx,
 846                 FILE *input, int nparam)
 847 {
 848         struct isl_map *map;
 849         map = isl_map_read_from_file(ctx, input, nparam);
 850         if (!map)
 851                 return NULL;
 852         isl_assert(ctx, isl_map_n_in(map) == 0, goto error);
 853         return (struct isl_set *)map;
 854 error:
 855         isl_map_free(map);
 856         return NULL;
 857 }
 858
 859 static char *next_line(FILE *input, char *line, unsigned len)
 860 {
 861         char *p;
 862
 863         do {
 864                 if (!(p = fgets(line, len, input)))
 865                         return NULL;
 866                 while (isspace(*p) && *p != '\n')
 867                         ++p;
 868         } while (*p == '#' || *p == '\n');
 869
 870         return p;
 871 }
 872
 873 static struct isl_vec *isl_vec_read_from_file_polylib(struct isl_ctx *ctx,
 874                 FILE *input)
 875 {
 876         struct isl_vec *vec = NULL;
 877         char line[1024];
 878         char val[1024];
 879         char *p;
 880         unsigned size;
 881         int j;
 882         int n;
 883         int offset;
 884
 885         isl_assert(ctx, next_line(input, line, sizeof(line)), return NULL);
 886         isl_assert(ctx, sscanf(line, "%u", &size) == 1, return NULL);
 887
 888         vec = isl_vec_alloc(ctx, size);
 889
 890         p = next_line(input, line, sizeof(line));
 891         isl_assert(ctx, p, goto error);
 892
 893         for (j = 0; j < size; ++j) {
 894                 n = sscanf(p, "%s%n", val, &offset);
 895                 isl_assert(ctx, n != 0, goto error);
 896                 isl_int_read(vec->el[j], val);
 897                 p += offset;
 898         }
 899
 900         return vec;
 901 error:
 902         isl_vec_free(vec);
 903         return NULL;
 904 }
 905
 906 struct isl_vec *isl_vec_read_from_file(struct isl_ctx *ctx,
 907                 FILE *input, unsigned input_format)
 908 {
 909         if (input_format == ISL_FORMAT_POLYLIB)
 910                 return isl_vec_read_from_file_polylib(ctx, input);
 911         else
 912                 isl_assert(ctx, 0, return NULL);
 913 }